This root form (lemma) is used in 2 different forms in the NT: εὐκαίρου (GFS), εὔκαιρον (AFS).
It is glossed in 1 way: ‘opportune’.
OET MARK 6:21 Greek word=εὐκαίρου (eukairou) Morphology=GFS English gloss=‘opportune’ SR GNT MARK 6:21 word 5
OET HEB 4:16 Greek word=εὔκαιρον (eukairon) Morphology=AFS English gloss=‘opportune’ SR GNT HEB 4:16 word 17